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A train speeds past a pole in 15 seconds and a platform 100 m long in 25 seconds. Its length is:

Correct Answer: 150 m

Explanation:

Let the length of the train be x metres and its speed by y m/sec.


Then, x = 15     ⟹     y = x .
y 15



x + 100 = x
25 15


⟹ 15(x + 100) = 25x


⟹ 15x + 1500 = 25x


⟹ 1500 = 10x


x = 150 m.


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